Well, KDS doesn't have much info and no help on their site.
But, if it is the power supply, it'll probably cost you $50-70 to replace it. Taking it to a shop will end up costing you maybe $60-80 for them to test it and tell you what the problem is. My wife just handed me Fry's ad from the paper and they have a 19" monitor for $140.

Of course, if it is still in warranty would go to KDS first. Even if not, maybe send them an e-mail and see if they respond.

I cannot be held responsible for the things that come out of my mouth.
In the Windows world, most everything folks don't understand is called a virus.